Stereotype plate casting machine



R. J. GREENWAY STEREOTYPE PLATE CASTING MACHINE Feb. 21, 1933.

Filed April 25, 1932 INVENTO BY ATTORNEYS Patented Feb. 21, 1933 UNETED STATES PATENT I o FICE RICHARD J". GREENWAY, OF WVESTERLY, RHODE ISLAND, ASSIGNOR TO C. B. GOTTRELL 86 SONS COMPANY, OF WESTERLY, RHODE ISLAND, A CORPORATION OF DELAWARE STEREOTYPE PLATE Application filed April 25.

In machines for casting curved stereotype. plates it has been customary to cast the plate of sufficient thickness to allow for smooth finishing of the back of the plate in a curved plate shaving machine or a thinning machine. This smooth finishing was necessary because the convex surface of the male member of the casting box is porous, thus causing the backof the cast plate to be more or less rough.

The object of my invention is to provide means whereby the necessity of smooth finishing or shaving the back of a curved stereotype plate is eliminated, said means comprising a smooth non-porous facing of heat I resisting material, such as clay surfacedzpaper, for the convex wall of the male member of the casting box; thereby enabling a curved plate to be cast of the desired thickness with a perfectly smooth back.

A practical embodiment of my invention is represented in the accompanying drawing, in which I Fig. 1 represents in front elevation so much of a curved stereotype plate casting machine as will give a clear understanding of my invention, portions of the female member, the matrix, the cast plate and the heat resisting facing sheet being broken away to show in full lines the parts back of the same;

Fig. Q'represents a vertical section through the casting box, taken in-the plane of the line IIII of Fig. 1, looking in the direction of the arrows, and

Fig. 3 represents a horizontal section through the casting box, taken in the plane of the line III-III of Fig. 1, looking in the direction of the arrows.

The casting box comprises the coacting male and female members 1 and 2, which members are brought together for casting the curved stereotype plate and are separated for removing the plate and, matrix,- in'rany well known or approved manner.

The matrix 3 is seated as usual along the concave wall of the female member 2 of the casting box before the plate a is cast. Also. before the plate is cast the convex wall of the male member 1 of the casting box is covered with a smooth non-porous facing 5 of heat resisting material, between which facing CASTING MACHINE 1932. Serial No. 607,407.

and the matrix the metal for the plate is poured after the casting box members are closed.

The heat resistingfacing is preferably composed of a clay surfaced sheet of paper which isproduced by running the sheet of paper through a clay. solution and then calendering thesheet to bring it to a uniform thickness- The heat resisting sheet or facing may be secured around the convex wall of the male member 1 of the casting box by suitable fastening devices, such as bolts 6 arranged along ofthe heat resisting facing of the male member, thereby ensuring a perfectly smooth back for the plate and eliminating the necessity of-subjecting the back of the plate to a shaving or thinning machine. i Y

" It is evident that various changes may be resorted to in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention, and hence I do not wish to be limited to the particular embodiment herein shown and described, but j What I claim is: V

1. In a curved stereotype plate casting machine, a male member provided with a smooth non-porous heat resisting facing.

2. In a curved stereotype plate casting machine, a male member provided with a smooth non-porous heat resisting facing com posed of a sheet of clay surfaced paper.

3. Ina curved stereotype plate casting machine, a male member and a smooth nonporous facing of heat resisting material re? movably secured overthe convex wall of the said member.

a. In a curved stereotype plate casting machine, a male member and a clay surfacedpaper sheet removably secured over the convex wall of the said member.

g In testimony, that I claim the foregoing as my invention, I have signed my name this 22d day of April, 1932. i

RICHARD J. GREENWAY. 

